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    Cell cycle-dependent phosphorylation of the 77 kDa echinoderm microtubule-associated protein (EMAP) in vivo and association with the p34(cdc2) kinase

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    2885.53.pdf (221.8Kb)
    Issue Date
    1996-12
    Author
    Suprenant, Kathy A.
    Daggett, Melissa A. F.
    Brisch, Ellen
    Publisher
    COMPANY OF BIOLOGISTS LTD
    Type
    Article
    Published Version
    http://jcs.biologists.org/content/109/12/2885
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    Abstract
    The most abundant microtubule-associated protein in sea urchin eggs and embryos is the 77 kDa echinoderm microtubule-associated protein (EMAP), EMAP localizes to the mitotic spindle as well as the interphase microtubule array and is a likely target for a cell cycle-activated kinase, To determine if EMAP is phosphorylated in vivo, sea urchin eggs and embryos were metabolically labeled with (PO4)-P-32 and a monospecific antiserum was used to immunoprecipitate EMAP from P-32-labeled eggs and embryos, In this study, we demonstrate that the 77 kDa EMAP is phosphorylated in vivo by two distinct mechanisms, In the unfertilized egg, EMAP is constitutively phosphorylated on at least five serine residues, During the first cleavage division following fertilization, EMAP is phosphorylated with a cell cycle-dependent time course, As the embryo enters mitosis, EMAP phosphorylation increases, and as the embryo exits mitosis, phosphorylation decreases, During mitosis, EMAP is phosphorylated on 10 serine residues and two-dimensional phosphopeptide mapping reveals a mitosis-specific site of phosphorylation, At all stages of the cell cycle, a 33 kDa polypeptide copurifies with the 77 kDa EMAP, regardless of phosphorylation state, Antibodies against the cdc2 kinase were used to demonstrate that the 33 kDa polypeptide is the p34(cdc2) kinase. The p34(cdc2) kinase copurifies with the mitotic apparatus and immunostaining indicates that the p34(cdc2) kinase is concentrated at the spindle poles, Models for the interaction of the p34(cdc2) kinase and the 77 kDa EMAP are presented.
    URI
    http://hdl.handle.net/1808/1716
    Collections
    • Molecular Biosciences Scholarly Works [598]
    Citation
    Brisch, E; Daggett, MAF; Suprenant, KA. Cell cycle-dependent phosphorylation of the 77 kDa echinoderm microtubule-associated protein (EMAP) in vivo and association with the p34(cdc2) kinase. JOURNAL OF CELL SCIENCE. DEC 1996. 109(Part 12): 2885-2893.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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